Trail Ridge (U.S. 34): This road through Rocky Mountain National Park is the highest continuous auto road in the country. Itâs truly an all-American icon â the road itself is listed on the National Register of Historic Places.
Lumber Dimensions. 2x4s are not actually 2 inches by 4 inches. When the board is first rough sawn from the log, it is a true 2x4, but the drying process and planing of the board reduce it to the finished 1.5x3.5 size. Here are the common sizes of lumber, and their actual sizes.
A truss of 2-by-4-inch lumber for a steep 6/12 pitch that rises 6 inches in 12 feet will cover almost twice the span as on a 2/12 roof, which slopes only 2 inches in 12 feet.